CN114226944A - Air pressure diffusion connection method for thin plates - Google Patents
Air pressure diffusion connection method for thin plates Download PDFInfo
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- CN114226944A CN114226944A CN202111629348.3A CN202111629348A CN114226944A CN 114226944 A CN114226944 A CN 114226944A CN 202111629348 A CN202111629348 A CN 202111629348A CN 114226944 A CN114226944 A CN 114226944A
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- parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
- B23K20/026—Thermo-compression bonding with diffusion of soldering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
Abstract
The invention provides an efficient sheet air pressure diffusion connection method, and belongs to the field of diffusion welding. The problem of waste of the process plate in diffusion welding can be solved. It comprises the following steps: s1, sequentially stacking a plurality of thin plates from bottom to top to form a group of parts, wherein the number of the parts is two, and an air exhaust channel is formed between every two vertically adjacent thin plates; s2, placing the two groups of parts in the step S1 in a mirror image overlapping mode, enabling the same air exhaust channel in the two groups of parts to be located at different positions, arranging a process cushion plate frame between the two groups of parts, and reserving an air ventilation flow channel on the process cushion plate frame; s3, respectively connecting the air exhaust channel and the air ventilation channel with air pipes to form an integral part to be welded, sealing and welding the integral part to be welded, forming a sealed cavity between the thin plates after sealing and welding, and communicating each air pipe with the corresponding sealed cavity; and S4, putting the whole to-be-welded member sealed and welded in the step S3 into a diffusion welding mould for diffusion welding.
Description
Technical Field
The invention belongs to the field of diffusion welding, and particularly relates to a sheet air pressure diffusion connection method.
Background
The diffusion bonding technology achieves the purpose of bonding by utilizing the mutual diffusion of atoms of materials under the action of certain conditions, can realize the bonding of metal and even the bonding of metal and nonmetal, and is a high-efficiency and reliable surface-to-surface bonding technology;
the intermetallic diffusion bonding is generally continuously applied with uniform and stable pressure under the high-temperature condition, the diffusion pressure is generally mechanical pressure or gas pressure, the uniformity of the mechanical pressure is ensured by the precision of equipment and tools, and the intermetallic diffusion bonding is most commonly applied to diffusion bonding of medium-small-size, multilayer and flat-plate structures. The gas pressure is often applied to diffusion connection with large size, special shape and fewer layers due to the characteristic of good uniformity, and for some materials with good plasticity and the plastic forming and diffusion connection temperature being close, two processes of superplastic forming and diffusion connection can be completed in one heating process, and products with functional complex appearance structures are manufactured;
generally, a sealing cavity is formed between a die and a plate to be connected, inert gas is filled into the sealing cavity to apply pressure, the method is tightly attached to the plate through a structure of a sealing stem on the die to generate a sealing effect, but the sealing mode has the problem of low reliability due to the influence of the die state or equipment precision. The method is characterized in that the process plates with the connecting plates and the same materials and the same size are sealed and welded to form a closed space, and inert gas is filled between the process plates and the plates to be connected to apply pressure, so that stable and reliable sealing can be realized, the diffusion connection quality can be ensured, but the increased process plates cause the increase of the processing cost;
therefore, solving the waste situation of the process plate is an urgent problem to be solved.
Disclosure of Invention
In view of the above, the present invention is directed to provide a method for gas pressure diffusion bonding of thin plates, which can solve the problem of waste of process plates in diffusion welding, improve the quality of diffusion bonding, and improve the bonding rate of finished products.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for gas pressure diffusion bonding of thin plates comprises the following steps:
s1, distinguishing a diffusion area from a non-diffusion area of the thin plates needing diffusion welding, and sequentially stacking the thin plates after distinguishing from bottom to top to form a group of parts, wherein the number of the parts is two, and an air exhaust channel is formed between every two adjacent thin plates;
s2, placing the two groups of parts in the step S1 in a mirror image overlapping mode, arranging a layer of process backing plate frame between the two groups of parts to form a piece to be welded, enabling air exhaust channels in the two groups of parts to be located at different positions of the piece to be welded, and reserving air ventilation channels on the process backing plate frame;
s3, respectively connecting the air exhaust channel in the step S1 and the air vent channel in the step S2 with air pipes to form an integral piece to be welded, performing circumferential side sealing welding on the integral piece to be welded, forming a sealed cavity between the thin plates after sealing welding, and communicating each air pipe with the corresponding sealed cavity;
s4, putting the whole to-be-welded piece sealed and welded in the step S3 into a diffusion welding mould for diffusion welding; and applying gas pressure in the gas pipe connected with the reserved ventilation flow channel on the process cushion plate frame, vacuumizing the gas pipe connected with the air exhaust channel, and simultaneously performing diffusion connection on the corresponding positions of the two groups of parts under the action of certain temperature, certain pressure and certain time.
Further, the air exhaust channel in the step S1 is: the corresponding positions of two adjacent sheets are respectively grooved and then stacked, and the grooves on the two adjacent sheets are enclosed to form an air exhaust channel.
Furthermore, the operation of the two sets of parts with the suction passages located at different positions of the workpiece to be welded in step S2 is as follows: and rotating one of the two groups of parts which are placed in a mirror image superposition manner by 180 degrees around the center of the part, so that the air exhaust channels in the two groups of parts are positioned at two sides of the part to be welded.
Furthermore, two air exhaust channels are formed by every two thin plates and are distributed in a central symmetry mode relative to the centers of the thin plates.
Further, the number of the thin plates in each group of the parts in the step S1 is 2-4.
Further, the processing manner of distinguishing the diffusion region from the non-diffusion region in step S1 is as follows: and adhering protective glue, carving according to a sample plate and spraying solder resist to the non-diffusion area of the adjacent plate.
Further, the sealing manner in step S3 is as follows: and welding by argon arc welding.
Further, a mechanical pressure exceeding the internal air pressure is applied to the outside of the diffusion welding mold in the step S4.
Furthermore, the gas introduced in step S4 is an inert gas, and the inert gas applies upward and downward pressure to the upper and lower groups of parts in the process cushion plate frame 6, and the pressure is the same.
Furthermore, the process cushion plate frame is formed by splicing four side frames, and the size and the shape of the process cushion plate frame 6 are the same as those of the thin plate.
Compared with the prior art, the invention has the beneficial effects that:
1. by means of two groups of two-piece superposition and adding the process cushion plate frame, the two groups of parts are mutually process plates, and the utilization rate of materials is improved;
2. the two process plates are mutually used as process plates, and the characteristic that the force in each direction of the air pressure is consistent is utilized to simultaneously complete the diffusion connection of the two groups of plates to be welded, so that the diffusion connection mode with high efficiency and low cost is realized on the premise of ensuring the diffusion connection quality;
3. the inert gas is used for ensuring the uniformity and stability of the air pressure, improving the quality of the weldment and improving the welding rate of diffusion bonding.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a three-layer flap structure according to the present invention;
FIG. 2 is a layered exploded view of a three-layer flap according to the present invention;
FIG. 3 is a schematic view of diffusion bonding of parts in a diffusion welding mold according to the present invention;
FIG. 4 is a schematic view of a pre-diffusion assembly according to the present invention.
In the figure: a skin sheet 1; a core layer plate 2; a side frame plate 3; a front vent groove 4; a back vent groove 5; a craft mat frame 6; a ventilation flow channel 7.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.
Referring to the drawings to explain the present embodiment, a method for gas pressure diffusion bonding of thin plates includes the steps of:
s1, the thin plate needing diffusion welding is divided into diffusion areas and non-diffusion areas, and the division processing method of the diffusion areas and the non-diffusion areas is as follows: carry out the sticky protection to the non-diffusion region of adjacent slab and glue, carve the type and spray solder resist according to the model, will distinguish a plurality of sheets after the processing from the bottom up and stack in proper order and form a set of part, the part is two sets of, and the quantity of sheet is 2-4 in every group part, forms pumping channel between every two adjacent sheets from top to bottom, and pumping channel is: the two adjacent thin plates are respectively slotted and then stacked, the slots on the two adjacent thin plates are enclosed to form two air exhaust channels, and the two air exhaust channels formed by every two thin plates are centrally and symmetrically distributed relative to the center of the thin plate;
s2, place two sets of part mirror image stacks in step S1 to set up one deck technology backing plate frame and form in the middle of two sets of parts and wait the weldment, the technology backing plate frame forms for four frames concatenation, and the size and the shape of technology backing plate frame all are the same with the sheet metal, and the pumping channel in two sets of parts is located the different positions of waiting the weldment, and the pumping channel in two sets of parts is located the operation mode who waits the different positions of weldment and is: rotating one of the two groups of parts which are placed in a mirror image superposition manner by 180 degrees around the center of the part, so that the air exhaust channels in the two groups of parts are positioned at two sides of the part to be welded, and reserving an air vent channel on the process cushion plate frame;
s3, respectively connecting the air exhaust channel in the step S1 and the air vent channel in the step S2 with air pipes to form an integral part to be welded, carrying out peripheral sealing welding on the integral part to be welded in an argon arc welding mode, forming a sealing cavity between the thin plates after sealing welding, and communicating each air pipe with the corresponding sealing cavity;
s4, placing the whole to-be-welded piece subjected to sealing welding in the step S3 into a diffusion welding die for diffusion welding, and applying mechanical pressure exceeding the internal air pressure outside the diffusion welding die to improve the reliability of a sealing mode; applying gas pressure in a gas pipe connected with a reserved ventilation flow channel on the process cushion plate frame, wherein the gas is inert gas, the inert gas applies upward and downward pressure to the upper group of parts and the lower group of parts in the process cushion plate frame, the pressure is the same, vacuumizing the gas pipe connected with the air exhaust channel, and simultaneously performing diffusion connection on the corresponding positions of the two groups of parts under the action of certain temperature, certain pressure and certain time.
Through the mode, the two groups of parts are overlapped for diffusion welding, the two groups of parts are mutually process plates, waste of the process plates is prevented, the two groups of parts are diffusion welded together, production efficiency is improved, the inert gas is used for guaranteeing uniformity and stability of air pressure, and quality of welded parts is improved.
The best embodiment is as follows:
carry out diffusion welding to certain three layer construction flap and handle, this type of product has cavity net muscle for curved surface structure middle, the net muscle outside is thickening frame, frame layer thickness 5mm all around, net muscle wall thickness 1mm, all the other position thickness 2mm, the flap can divide into 3 layers, the bottommost is skin board 1, thickness is 1mm, middle core plate 2 that is, have the net muscle that the superplastic forming formed, its wall thickness is 1mm, the top is 3mm of 3 thicknesses of frame board, this three-layer diffusion connects becomes an overall structure.
S1, performing the distinguishing treatment of the diffusion area and the non-diffusion area on the skin plate 1, the core plate 2 and the frame plate 3 which need to be diffusion welded, wherein the distinguishing treatment mode of the diffusion area and the non-diffusion area is as follows: carry out the part to the non-diffusion region of adjacent slab and glue the protection and glue, carve the type and spray solder resist according to the model, will distinguish skin board 1, core plate 2 and the 3 from the bottom up of border panel after handling and stack in proper order and form a set of part, the part is two sets of, forms pumping channel between skin board 1 and core plate 2, core plate 2 and border panel 3, and pumping channel is: the skin plate 1 is provided with a front vent groove 4 and a back vent groove 5 at positions corresponding to the core plate 2 respectively for stacking, the front vent groove 4 and the back vent groove 5 are enclosed to form an air exhaust channel, the number of the air exhaust channels is two, the air exhaust channels are centrally and symmetrically distributed relative to the center of the plate sheet, the core plate 2 is provided with a front vent groove 4 and a back vent groove 5 at positions corresponding to the frame plate 3 respectively for stacking, and the front vent groove 4 and the back vent groove 5 are enclosed to form an air exhaust channel;
s2, placing the two groups of parts in the step S1 in a mirror image overlapping mode, arranging a layer of process cushion plate frame 6 between the two groups of parts to form a piece to be welded, enabling air exhaust channels in the two groups of parts to be located at different positions of the piece to be welded, rotating one group of parts of the two groups of parts in the mirror image overlapping mode 180 degrees around the center of the part, enabling the air exhaust channels in the two groups of parts to be located on two sides of the piece to be welded, reserving an air flow channel 7 on the process cushion plate frame 6, arranging a layer of process cushion plate frame 6 between the two groups of parts, enabling the width of the process cushion plate frame 6 to be 20mm and the thickness of the process cushion plate frame 6 to be 1mm, splicing four frames of the process cushion plate frame 6, enabling the size and the shape of the process cushion plate frame 6 to be the same as those of the frame plates 3, reserving the air flow channel 7 on the process cushion plate frame 6, and enabling the size of the air flow channel 7 to be 6mm wide;
s3, connecting the air exhaust channel in the step S1 and the air vent channel 7 in the step S2 with air pipes respectively to form an integral part to be welded, carrying out peripheral side sealing welding on the integral part to be welded by argon arc welding, forming a sealing cavity between the thin plates after sealing welding, and communicating each air pipe with the corresponding sealing cavity;
s4, putting the whole to-be-welded piece sealed and welded in the step S3 into a diffusion welding mould for diffusion welding; apply gas pressure in reserving the trachea that the runner 7 of ventilating is connected on technology backing plate frame 6, carry out the evacuation with the trachea that the pumping channel is connected, under certain temperature, certain pressure and certain time effect, carry out the diffusion bonding to the relevant position of two sets of parts simultaneously, concrete data is: the temperature was 920 ℃ and the pressure 1.8 MPa for 1.5 hours.
The embodiments of the invention disclosed above are intended merely to aid in the explanation of the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention.
Claims (10)
1. A method for connecting thin plates by air pressure diffusion is characterized in that: the method comprises the following steps:
s1, distinguishing a diffusion area from a non-diffusion area of the thin plates needing diffusion welding, and sequentially stacking the thin plates after distinguishing from bottom to top to form a group of parts, wherein the number of the parts is two, and an air exhaust channel is formed between every two adjacent thin plates;
s2, placing the two groups of parts in the step S1 in a mirror image overlapping mode, arranging a layer of process backing plate frame between the two groups of parts to form a piece to be welded, enabling air exhaust channels in the two groups of parts to be located at different positions of the piece to be welded, and reserving air ventilation channels on the process backing plate frame;
s3, respectively connecting the air exhaust channel in the step S1 and the air vent channel in the step S2 with air pipes to form an integral piece to be welded, performing circumferential side sealing welding on the integral piece to be welded, forming a sealed cavity between the thin plates after sealing welding, and communicating each air pipe with the corresponding sealed cavity;
s4, putting the whole to-be-welded piece sealed and welded in the step S3 into a diffusion welding mould for diffusion welding; and applying gas pressure in the gas pipe connected with the reserved ventilation flow channel on the process cushion plate frame, vacuumizing the gas pipe connected with the air exhaust channel, and simultaneously performing diffusion connection on the corresponding positions of the two groups of parts under the action of certain temperature, certain pressure and certain time.
2. A method of gas pressure diffusion bonding of sheets as claimed in claim 1, wherein: the air exhaust channel in the step S1 is: the corresponding positions of two adjacent sheets are respectively grooved and then stacked, and the grooves on the two adjacent sheets are enclosed to form an air exhaust channel.
3. A method of gas pressure diffusion bonding of sheets as claimed in claim 1, wherein: the operation mode that the air exhaust channels in the two groups of parts are positioned at different positions of the piece to be welded in the step S2 is as follows: and rotating one of the two groups of parts which are placed in a mirror image superposition manner by 180 degrees around the center of the part, so that the air exhaust channels in the two groups of parts are positioned at two sides of the part to be welded.
4. A method of gas pressure diffusion bonding of sheets as claimed in claim 1, wherein: the two air exhaust channels formed by every two thin plates are distributed in a central symmetry mode relative to the centers of the thin plates.
5. A method of gas pressure diffusion bonding of sheets as claimed in claim 1, wherein: the number of the thin plates in each group of the parts in the step S1 is 2-4.
6. A method of gas pressure diffusion bonding of sheets as claimed in claim 1, wherein: the processing manner of distinguishing the diffusion region from the non-diffusion region in step S1 is as follows: and adhering protective glue, carving according to a sample plate and spraying solder resist to the non-diffusion area of the adjacent plate.
7. A method of gas pressure diffusion bonding of sheets as claimed in claim 1, wherein: the sealing welding mode in the step S3 is as follows: and welding by argon arc welding.
8. A method of gas pressure diffusion bonding of sheets as claimed in claim 1, wherein: applying a mechanical pressure exceeding the internal air pressure to the outside of the diffusion welding mold in the step S4.
9. A method of gas pressure diffusion bonding of sheets as claimed in claim 8, wherein: the gas introduced in the step S4 is inert gas, and the inert gas applies upward and downward pressure to the upper and lower groups of parts in the process cushion plate frame, and the pressure is the same.
10. A method of gas pressure diffusion bonding of sheets as claimed in claim 9, wherein: the technical cushion plate frame is formed by splicing four side frames, and the size and the shape of the technical cushion plate frame are the same as those of a thin plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111629348.3A CN114226944A (en) | 2021-12-28 | 2021-12-28 | Air pressure diffusion connection method for thin plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111629348.3A CN114226944A (en) | 2021-12-28 | 2021-12-28 | Air pressure diffusion connection method for thin plates |
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| Publication Number | Publication Date |
|---|---|
| CN114226944A true CN114226944A (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111629348.3A Pending CN114226944A (en) | 2021-12-28 | 2021-12-28 | Air pressure diffusion connection method for thin plates |
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| CN (1) | CN114226944A (en) |
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- 2021-12-28 CN CN202111629348.3A patent/CN114226944A/en active Pending
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